Power control method of electromagnetic heating device

An electromagnetic heating device and power control technology, applied in the direction of electric heating device, induction heating control, electric/magnetic/electromagnetic heating, etc., can solve the problems of reducing the service life of IGBT, generating noise, affecting user experience, etc., and achieve the goal of reducing the turn-on current Effect

Inactive Publication Date: 2019-06-18
JOYOUNG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the period of T1, the alternating current charges the capacitance of the circuit, so that the voltage across the IGBT is stable at V1, and its theoretical value is 311V. When the IGBT is turned on at t

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  • Power control method of electromagnetic heating device
  • Power control method of electromagnetic heating device
  • Power control method of electromagnetic heating device

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Embodiment Construction

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0027] see figure 2 , which is a circuit diagram used in an embodiment of the power control method of the electromagnetic heating device of the present invention. The electromagnetic heating device includes a controller 1, a switching circuit 2, a rectifying circuit 3, a resonant circuit 4 and a power tube 5, the rectifying circuit 3 is used to rectify alternating current, the switching circuit 2 is connected to the rectifying circuit 3, To control the rectificat...

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Abstract

The invention provides a power control method of an electromagnetic heating device. The method comprises the following steps: judging whether target heating power is greater than a preset value; adjusting a switching circuit to control a rectifying circuit to output full-wave rectified waveform when the target heating power is greater than the preset value, and enabling the controller to send outa control signal to drive the connection of the power tube, thereby enabling a resonance circuit to work; when the target heating power is less than the preset value, adjusting the switching circuit to control the rectifying circuit to output half-wave rectified waveform, and then enabling the controller to send out the control signal to drive the connection of the power tube at the subsequent t1moment, thereby enabling the resonance circuit to work, wherein the t1 moment is the moment without waveform output of the half-wave rectified waveform, or the moment after the half-wave rectified waveform at least experiences a half-wave cycle without waveform. The IGBT is turned on at zero voltage or low voltage when the small power heating is guaranteed, the noise is reduced, and the service life of the IGBT is improved.

Description

technical field [0001] The invention relates to the technical field of kitchen appliances, in particular to a power control method for an electromagnetic heating device. Background technique [0002] The heating principle of the electromagnetic heating device is that the electromagnetic heating device generates an alternating magnetic field, and the ferromagnetic material placed in the alternating magnetic field generates heat by itself due to induction. Electromagnetic heating is more common in cooking utensils, such as induction cooker, IH rice cooker, etc. Cooking utensils using electromagnetic heating are popular among users because of their high thermal efficiency, cleanliness, and convenience. Electromagnetic heating cooking utensils need to use IGBT alternating on and off to achieve electromagnetic resonance. When heating with high power, the IGBT works well, but when heating with low power, there is a relatively high voltage at both ends of the IGBT. The low power s...

Claims

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Application Information

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IPC IPC(8): H05B6/06
CPCH05B6/062
Inventor 朱泽春胡炜张伟米帅宇
Owner JOYOUNG CO LTD
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